Intestinal Malrotation and Volvulus in Adults: Symptoms and UK Management

Intestinal malrotation is a congenital anomaly that occurs during the very early stages of pregnancy. In a typical pregnancy, the fetal bowel undergoes a complex series of rotations and fixations before settling into its final position in the abdomen. When this process is interrupted or incomplete, the intestines are not properly anchored. This results in the small bowel being located on the right side of the abdomen and the large bowel (colon) on the left.

While the condition itself is present from birth, it is not always immediately apparent. According to NHS clinical data, while most cases are identified in the first month of life, a significant number of individuals reaching adulthood are unaware they have the condition. For some, it is found incidentally during surgery for another issue, such as appendicitis. For others, it manifests as chronic digestive distress or a sudden, life-threatening blockage known as a volvulus.

Unlike the acute presentation seen in newborns, adults with intestinal malrotation often experience 'vague' or intermittent symptoms that may be misdiagnosed as Irritable Bowel Syndrome (IBS) or functional dyspepsia.

Chronic Symptoms

• Recurrent, cramp-like abdominal pain that comes and goes.
• Persistent bloating and a feeling of 'fullness' shortly after eating.
• Chronic nausea or occasional vomiting of bile (greenish fluid).
• Changes in bowel habits, such as alternating constipation and diarrhoea.

Acute Symptoms (The Volvulus)

A midgut volvulus occurs when the bowel twists around its own blood supply (the mesenteric artery). This is a surgical emergency. Symptoms include sudden, excruciating abdominal pain, absolute constipation (inability to pass gas or stool), and rapid onset of vomiting. If you experience these symptoms, you must attend an A&E department immediately.

The precise cause of intestinal malrotation is not fully understood, though it is categorized as a developmental glitch rather than a result of anything the mother did during pregnancy. There is no evidence currently suggested by NICE (National Institute for Health and Care Excellence) that lifestyle factors or diet contribute to the development of this anatomical anomaly.

In adults, the primary risk factor is the presence of 'Ladd’s bands'. these are abnormal bands of peritoneal tissue that attach the malrotated cecum to the abdominal wall. These bands can compress the duodenum (the first part of the small intestine), leading to chronic obstruction symptoms even if a full twist (volvulus) has not occurred.

If you present to your GP with chronic abdominal pain, they will initially rule out more common conditions. However, if symptoms persist, they may refer you for diagnostic imaging. In the UK healthcare system, the 'gold standard' for diagnosing malrotation in adults is often an Upper Gastrointestinal (GI) Contrast Study. You swallow a barium liquid while an X-ray technician observes how it moves through your gut.

Other diagnostic tools include:

• CT Scan: Often the first tool used in an emergency setting, a CT scan can show the 'whirlpool sign', which indicates a twisted mesentery.
• Ultrasound: Useful for checking blood flow in the mesenteric vessels, though less definitive in adults than in children.
• MRI: Sometimes used to assess the positioning of the bowel without using radiation.

Living with undiagnosed abdominal pain can be distressing. Many patients find that their symptoms are dismissed as 'stress' or 'dietary issues'. By choosing to speak to a GP online, you can have a calm, evidence-based discussion about your clinical history from the comfort of your home.

An online doctor can:

• Review your symptoms and identify 'red flags' that require urgent investigation.
• Advise on whether your symptoms align with malrotation or other conditions like GORD or Gastritis.
• Provide a private referral for imaging if necessary.
• Issue supporting documentation or sick notes if your symptoms are impacting your ability to work.

Seeking an expert opinion early can prevent the psychological burden of 'invisible' illness and ensure you are on the right pathway for a definitive diagnosis.

The definitive treatment for malrotation, particularly when symptomatic, is a surgical intervention known as the Ladd’s Procedure. During this operation, a surgeon untwists any volvulus present, divides the abnormal Ladd’s bands, and broadens the base of the mesentery to prevent future twisting. The appendix is also usually removed, as its abnormal position after surgery would make diagnosing future appendicitis very difficult.

In many UK hospitals, this can now be performed laparoscopically (keyhole surgery), which leads to a faster recovery time. It is important to note that the surgery does not 'fix' the rotation—the bowel remains in a non-standard position—but it significantly reduces the risk of a life-threatening volvulus.